化学学报 ›› 1965, Vol. 31 ›› Issue (2): 101-110.    下一篇

论文

碳-14试样自吸收的校正

郭慎独, 顾其顺, 李云華   

  1. 中国科学院应用化学研究所
  • 收稿日期:1964-03-10 出版日期:1965-02-15 发布日期:2013-06-03

SELF-ABSORPTION CORRECTION FOR CARBON-14 SAMPLES

KUO SHEN-Tu, KU CHI-SHUN, LI YUN-HUA   

  1. Institute of Applied Chemistry, Academia Sinica
  • Received:1964-03-10 Online:1965-02-15 Published:2013-06-03

本文从试样盘具反散射以及試样本身具自吸收、自散射和反散射本領的观点出发,提出一綜合性半經驗自吸收公式:I=m/(am+be-cm)其中I——试样厚度为m时測得的放射性強度;m——試样厚度;a,b,c——常数.利用同一碘-14标記乙醛制出的不同厚度的标記碳酸鋇和标記2,4-二硝基苯腙試样証明上式在外推至厚度为无限薄时仍然适用.这就能利用任意厚度的試样进行放射性強度的絕对测量.将上式与現有的負指数型和双曲綫型自吸收公式比較,可明确后两經驗公式的缺点以及其适用范围.

A semi-empirical formula is proposed which may well describe the complex phenomena of the absorption and scattering of weak beta rays emitted by the radioactive sampies of different thicknesses mounted on planchets.The formula obtained as a result of a theoretical consideration of the back-scattering of the sample mount and the backscattering,the self-scattering as well as the self-absorption of the sample itself is I=m/(am+be-cm) where Ⅰ is the observed counting rate in counts perminutem is the weight of the sample over a fixed area,and a,b and c are constants.